[Jan Anton Gilles]

I wonder if it is possible to biscuit fire porcelain at a lower temperture than 1300 °C , maybe soms chemical product ?????
Can anyone give me a clue

You can mail me also
Gillesabm@skynet.be

[neilestrick]

Not sure what you're looking for here. 1300C is about cone 10, which is normal for high fire porcelain glaze firing. You should bisque fire somewhere between cone 08-03 before applying the glaze.

[Chris Campbell]

Jan
Could you be more specific in your question? There are many ways to fire porcelain so explain what you are trying to do.

[Marcia Selsor]

yes. I bisque porcelain to Cone 04 usually but when I was doing crystalline glazes and firing them on bricks cut to fit their bases in a catch basin, I bisqued at high fire temperatures to avoid shrinking in the final firing. This process was recommended by Herbert Sanders. This was necessary because the crystalline glazes are very caustic and one actually ate a hole in my kiln floor when it fell off the brick during the firing. crystalline glazes are required to be very fluid in order to grow the crystals. people have gotten very inventive in the recent decade in firing and using interesting forms and avoiding the high fire bisque.

So unless you are doing some kind of process that requires no shrinkage in the high fire, I see no need to bisque at the high temperature.

Marcia